"a vuoto" meaning in Italian

{
  "derived": [
    {
      "_dis1": "0 0",
      "word": "andare a vuoto"
    },
    {
      "_dis1": "0 0",
      "word": "girare a vuoto"
    },
    {
      "_dis1": "0 0",
      "word": "assegno a vuoto"
    },
    {
      "_dis1": "0 0",
      "word": "battuta a vuoto"
    },
    {
      "_dis1": "0 0",
      "word": "scatto a vuoto"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "at empty"
      },
      "expansion": "“at empty”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "at empty"
      },
      "expansion": "Literally, “at empty”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “at empty”.",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prepositional phrase"
      },
      "expansion": "a vuoto",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "99 1",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "english": "to speak in vain",
          "text": "parlare a vuoto",
          "type": "example"
        },
        {
          "english": "fruitless effort",
          "text": "sforzo a vuoto",
          "type": "example"
        }
      ],
      "glosses": [
        "to no purpose, in vain"
      ],
      "id": "en-a_vuoto-it-prep_phrase-2B5RfdRp",
      "links": [
        [
          "to no purpose",
          "to no purpose"
        ],
        [
          "in vain",
          "in vain"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) to no purpose, in vain"
      ],
      "tags": [
        "idiomatic"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "it",
          "name": "String instruments",
          "orig": "it:String instruments",
          "parents": [
            "Musical instruments",
            "Music",
            "Tools",
            "Art",
            "Sound",
            "Technology",
            "Culture",
            "Energy",
            "All topics",
            "Society",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "open strings",
          "text": "corde a vuoto",
          "type": "example"
        },
        {
          "text": "Alla tredicesima battuta quel si va suonato a vuoto.",
          "type": "example"
        },
        {
          "text": "Per questo pezzo devo riaccordare lo strumento con il re a vuoto sulla sesta.",
          "type": "example"
        }
      ],
      "glosses": [
        "open (of a string)"
      ],
      "id": "en-a_vuoto-it-prep_phrase-t70anWO6",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "open",
          "open"
        ]
      ],
      "raw_glosses": [
        "(music) open (of a string)"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "a vuoto"
}

{
  "categories": [
    "Italian entries with incorrect language header",
    "Italian lemmas",
    "Italian multiword terms",
    "Italian prepositional phrases",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "andare a vuoto"
    },
    {
      "word": "girare a vuoto"
    },
    {
      "word": "assegno a vuoto"
    },
    {
      "word": "battuta a vuoto"
    },
    {
      "word": "scatto a vuoto"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "at empty"
      },
      "expansion": "“at empty”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "at empty"
      },
      "expansion": "Literally, “at empty”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “at empty”.",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prepositional phrase"
      },
      "expansion": "a vuoto",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "Italian idioms",
        "Italian terms with usage examples"
      ],
      "examples": [
        {
          "english": "to speak in vain",
          "text": "parlare a vuoto",
          "type": "example"
        },
        {
          "english": "fruitless effort",
          "text": "sforzo a vuoto",
          "type": "example"
        }
      ],
      "glosses": [
        "to no purpose, in vain"
      ],
      "links": [
        [
          "to no purpose",
          "to no purpose"
        ],
        [
          "in vain",
          "in vain"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) to no purpose, in vain"
      ],
      "tags": [
        "idiomatic"
      ]
    },
    {
      "categories": [
        "Italian terms with usage examples",
        "Requests for translations of Italian usage examples",
        "it:String instruments"
      ],
      "examples": [
        {
          "english": "open strings",
          "text": "corde a vuoto",
          "type": "example"
        },
        {
          "text": "Alla tredicesima battuta quel si va suonato a vuoto.",
          "type": "example"
        },
        {
          "text": "Per questo pezzo devo riaccordare lo strumento con il re a vuoto sulla sesta.",
          "type": "example"
        }
      ],
      "glosses": [
        "open (of a string)"
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "open",
          "open"
        ]
      ],
      "raw_glosses": [
        "(music) open (of a string)"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "a vuoto"
}